The Abominable Dr. Lenny is an evil scientist and a supervillain.
History
He once captured Fruit Bat Man and said that Fruit Bat Man was no match for him.
It is implied that he was not in fact among the "fakes" that Fruit Bat Man captured and thus a genuine supervillain, as when Smithers revealed to Fruit Bat Man's true identity, Charles Montgomery Burns, that the "crooks" Fruit Bat Man had stopped were hired by him as a means of protection, he was quick to point out that one of them actually WAS a crook.